Exploring Cyclization Strategies to Access <i>Stemona</i> Alkaloids: Subtle Effects Influencing Reactivity in Intramolecular Michael Additions
作者:Wesley J. Olivier、Rasool BabaAhmadi、Nigel T. Lucas、Alireza Ariafard、Alex C. Bissember、Jason A. Smith
DOI:10.1021/acs.orglett.1c03205
日期:2021.11.5
bearing pendant Michael acceptors that were identified during syntheses of Stemona alkaloids. Integrated experimental and theoretical studies reveal the profound influence that substituent effects have on the viability of these transformations. Additionally, we identify that electronic effects, in addition to barrier-lowering secondary orbital interactions within transition states, account for the
本报告研究了在百部生物碱合成过程中鉴定的带有迈克尔侧基受体的 Brønsted 酸介导的吡咯底物环化反应性模式的基本基础。综合实验和理论研究揭示了取代基效应对这些转变的可行性的深远影响。此外,我们发现,除了降低过渡态内的二级轨道相互作用之外,电子效应还解释了 7- endo -trig 环化比 6 - exo -trig 环化的排他性偏好。